Great deal involving railway boosted region (5)
I believe the answer is:
tyrol
'region' is the definition.
(Tyrol is an example)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tyrol that I've seen before include "ski region" , "Austrian province" , "Alpine state of Austria" , "Austrian Alpine state (English spelling)" , "hills here" .)